Princeton's WordNet

1. baffling, elusive, knotty, problematic, problematical, tough(adj)

   making great mental demands; hard to comprehend or solve or believe

   "a baffling problem"; "I faced the knotty problem of what to have for breakfast"; "a problematic situation at home"

2. gnarled, gnarly, knotted, knotty, knobbed(adj)

   used of old persons or old trees; covered with knobs or knots

   "gnarled and knotted hands"; "a knobbed stick"

3. Byzantine, convoluted, involved, knotty, tangled, tortuous(adj)

   highly complex or intricate and occasionally devious

   "the Byzantine tax structure"; "Byzantine methods for holding on to his chairmanship"; "convoluted legal language"; "convoluted reasoning"; "the plot was too involved"; "a knotty problem"; "got his way by labyrinthine maneuvering"; "Oh, what a tangled web we weave"- Sir Walter Scott; "tortuous legal procedures"; "tortuous negotiations lasting for months"

4. knotty, snarled, snarly(adj)

   tangled in knots or snarls

   "a mass of knotted string"; "snarled thread"

Wiktionary

1. knotty(Adjective)

   Full of knots.

   knotty pine

2. knotty(Adjective)

   Complicated or tricky; complex; difficult.

   a knotty problem

Webster Dictionary

1. Knotty(u)

   full of knots; knotted; having many knots; as, knotty timber; a knotty rope

2. Knotty(u)

   hard; rugged; as, a knotty head

3. Knotty(u)

   difficult; intricate; perplexed

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